Spartan: Total Warrior - Got it on release about 8 years ago, still play it to this day despite compleing it many times. Great hack and slash with greek mythology fantasy nonsense mixed in.

Rally Championship - A 2nd gen game from about 2003, awful career mode and only 8 multiplayer tracks, but if you can get 3 friends to play with it is one of the most fun games I have ever played. I am yet to meet anyone who has played it outside of my house.

All the main series Pokemon games - Easily the series I've spent the most time on, Silver was the first game I ever owned and I've loved them ever seince then. I know they're usually pretty highly rated, but not high enough IMO.